Jet vortex spinning technology enhances power

How to use innovative technology to develop jet vortex spinning novel yarns, broaden its application fields, avoid the homogenization competition with ring spinning, and increase the added value of its products is the primary task of developing jet vortex spinning technology.

Jet vortex spinning is a new spinning technology in the current spinning system. Compared with traditional ring spinning, jet vortex spinning has the characteristics of short spinning process, high production efficiency, high degree of intelligent automation of online quality monitoring, and labor saving. It can alleviate the difficulties of domestic spinning enterprises and high processing costs, but with Compared with ring spinning, there are also disadvantages of low yarn strength, high requirements for raw material selection, and limited adaptability of varieties. Therefore, in practical applications, we must develop strengths and circumvent weaknesses, give full play to its technical equipment advantages, and develop various types of novel yarns. Line, evade competition with homogenization of ring spinning to maximize its benefits.

Develop innovative yarn development applications

How to use innovative technology to develop novel yarns for jet vortex spinning, broaden its application fields, avoid competition with homogenization of ring spinning, and increase the added value of its products is the primary task of developing jet vortex spinning technology. In recent years, on the basis of learning advanced enterprise experience, many spinning enterprises in Zhejiang have actively developed five types of yarns based on market demand and applying innovative technologies, so that vortex spinning is not only applied in knitting and woven fabrics, but also A preliminary breakthrough has also been made in the field of home textiles, decorative and semi-worsted knit fabrics, thus expanding the application field of vortex spinning.

Innovative development of color spinning. The use of jet vortex spinning to develop color spinning yarns, woven into fabrics with the advantages of less hairiness, good wear resistance, etc., can further increase the added value of the yarn and increase the profit margin. Therefore, in recent years, more and more companies have produced color spinning on jet vortex spinning machines. Huzhou Weida Group, Huafu Jinbo Textile, Hangzhou Hongyang, Hangzhou Aohua Textile and other enterprises have successfully developed three series of color spinning yarns on the jet vortex spinning machine. One is the hemp gray series of color spinning yarn, which has two types of pure viscose and viscose blended yarn. The second is the color series of color spinning yarn, which is a color spinning yarn developed by the combination of colored viscose and other colored fibers on the basis of the development of the hemp gray series yarn. The third is a variety of fiber-color spinning yarns, which have the disadvantage of being too low in the strength of the color-spinning yarn with the main body of the viscose fiber, and the use of mixed spinning with other kinds of fibers can overcome the problem of low strength.

Innovative development of functional yarns. The development of functional yarns is also a hot spot in the current production field. In recent years, Zhejiang spinning companies have made some progress in developing functional yarns on jet vortex spinning machines. For example, Zhejiang Hongyang Group's innovative “Warming Yarn” is a yarn with warmth, deodorization and antibacterial function. It uses 45% hollow polyester , 25% gray coffee charcoal polyester, 30% modal, and 3 kinds of fiber. Blended 37tex vortex yarn. Zhejiang Aohua Textile Co., Ltd. cooperated with Shanghai Defulun Chemical Fiber Co., Ltd. to develop vortex spinning yarns with various functions by blending super-imitation cotton fiber, silky velvet fiber and kusima fiber with viscose fiber. Enterprise and users praise.

Innovative development of vortex spun yarns using a combination of natural fibers. Vortex spinning is a coated structural yarn. The selection of raw materials is more demanding than ring spinning. How to expand the application of various natural fibers in vortex spinning is technically difficult. Through continuous research and research, Zhejiang Textile Enterprise successfully developed a variety of vortex spinning yarns made from natural fibers using multi-fiber combined spinning methods. Such as linen/cotton 20tex blended yarn developed by Ningbo Fenghua Shuangdun Textile Co., Ltd.

Innovative development of core yarns on jet vortex spinning machines. The vortex spinning technology creates the conditions for solving the drawbacks of the core yarn of the core yarn. From the analysis of the vortex yarn forming mechanism, the filament can be evenly coated by the outer fiber when passing through the middle nozzle, so that the filament can be in the middle of the yarn. Eliminate the drawbacks of core wire exposure. Based on the advantages of jet vortex spinning to produce core-spun yarn, Shandong Dezhou Huayuan took the lead in developing and producing core-spun yarn. Zhejiang Aohua Textile Co., Ltd. also introduced the production of core-spun yarn device based on the experience of Huayuan, and successfully developed a variety of Jet vortex spun core yarn. Since the production of core-spun yarns on jet vortex spinning machines has a significant advantage over ring spinning, it is also the direction for the development of new yarns in jet vortex spinning.

Innovative development of decorative fabrics and vortex spinning for wool knitting. In recent years, Zhejiang textile enterprises have developed five new types of yarns for jet vortex spinning. Jet vortex spinning yarns are using a variety of fibers, multi-color fibers, and more production from the use of single raw materials, small production varieties, and limited use. Variety and multi-purpose development. The excellent performance of the yarn has been recognized by the downstream enterprises and consumers. The development of distinctive jet vortex spinning yarns is also an effective way to maximize the benefits of the company. According to the survey, all enterprises that have made achievements in the development of vortex spinning novel yarns in recent years have achieved good economic benefits and their production capacity has been expanded accordingly.

Reasonable configuration process to meet small batch demand

It can be seen that China's jet vortex spinning technology has changed from large-volume production of conventional viscose yarn to multi-fiber blending and various spinning process combinations through the continuous innovation in recent years, showing the characteristics of small batch and variety. In order to adapt to the characteristics of the variety change, the original pre-spinning preparation process must be adjusted accordingly.

The equipment for the carding process is adapted to the production requirements of small batches and multiple varieties. The original production line of the carding and combing unit has to be transformed into a short-flow carding machine model. For example, Zhejiang Aohua Textile Co., Ltd. has only 30 jet vortex spinning machines, but there are 6 production lines for cleaning and combing, and all adopt disc-type cotton picking machines to accommodate small batches of cotton, and each carding line is equipped with carding. The number of machines is at least 4 and the maximum is 8. With 6 production lines, 6 different types of vortex spinning yarns can be produced simultaneously to meet the production of multiple varieties.

The drawing process is produced by a combination of various fibers, so it is not possible to use a single cotton-blend method. The combination of cotton-blend cotton and sliver blending must be carried out in a three-way configuration to improve mixing uniformity. Autoleveling technology is needed on the final draw frame to improve the uniformity of the length of the sliver and provide a good semi-finished product for vortex spinning.

To optimize the pre-spinning process design, process parameters are designed based on the raw materials used. Since there are many non-cotton fibers currently used in production, the key to clearing is to open small blows and less cotton to reduce fiber damage. In the carding process, the principle of “light weight, low speed, good transfer, less damage to fibers” should be adopted according to the characteristics of the fiber to adjust the speed ratio of the cylinder to the licker, and the combing elements are preferably used according to different raw material characteristics to reduce the carding strip. The knot in the knot and the velvet rate. The focus of the drawing process is to improve the "three degrees" (straightness, parallelism, resolution) of the sliver through the three-way process, so the speed should not be too fast to ensure the quality of the sliver.

Do a good pre-spinning pre-treatment to ensure smooth production

Since jet vortex spinning is currently developing in the direction of multi-variety production, there are many varieties of fibers and large differences in performance. In order to improve the spinnability and produce high-quality yarns, it is very important to pre-treat various raw materials. From the fiber performance analysis, there are generally two types of raw materials that need special attention. One is fibers with poor initial moisture absorption and the other is fibers with good moisture absorption but smooth surface and poor cohesiveness. . These two types of fibers are prone to static electricity during high-speed operation of jet vortex spinning, winding rollers and rubber rollers (rings), increasing breakage and reducing production efficiency. Therefore, the pre-spinning pretreatment focuses on reducing the electrostatic charge and improving the spinnability. The pretreatment can be divided into three steps: one is the hemp fiber and the coarse denier polyester with high initial modulus and rigidity, which can reduce the rigidity and improve the spinnability of the fiber by pretreatment. The second is the raw materials for modal, Tencel, bamboo pulp fiber, etc. The pretreatment method is to store the raw materials into the workshop for 24 hours, and spray them on the cotton picker to make the moisture content of the raw materials reach about 10%, so that the whole The production process is in a dehumidified state. The third is the rigid extra large fiber such as hemp, which is treated with warming, moisturizing and spraying oil. The hemp after spraying the oil is stored at 25 ° C for 96 hours, and is repeatedly turned over to reduce the fiber. Bonding.

Optimize process parameters to maximize benefits

The process parameters of the jet vortex spinning, such as the spinning speed, the distance from the front roller jaw to the front end of the spindle, the nozzle pressure, the feed ratio, etc., have a direct impact on the production and should be optimized according to the spinning variety.

Spinning speed. The speed is fast, the coating time is short, the yarn feels soft, but the strength and wear resistance of the yarn are reduced, and the chance of weak crepe is increased. Especially when producing the color spinning, the color fiber is lower than the original fiber, so The spinning speed should be appropriately reduced to maintain a certain strength of the yarn. In addition, in order to achieve a good coating effect in the production of the core yarn, the speed should be appropriately reduced.

The distance between the front roller jaws and the front end of the spindle. When the distance is large, the ratio of the outer wrap fibers is increased, and a soft solid yam yarn can be formed. However, if the distance is too large, the fiber drop is increased and the production rate is lowered. Therefore, it should be grasped according to the average length of the fibers used.

Nozzle pressure. The nozzle pressure should be determined based on the nature of the fiber used. If the polyester fiber is rigid, the nozzle pressure should be appropriately increased. When using flexible fibers such as viscose, the nozzle pressure can be appropriately reduced, generally between 0.5 MPa and 0.6 MPa. When the nozzle pressure is large, the energy consumption is increased, because the energy consumption of the jet vortex spinning is mainly on the air compressor for the nozzle pressure.

Spindle diameter. The spindle diameter should be selected according to the number of spinning. The number of spinning numbers is coarse, the diameter of the spindle is larger, and vice versa. The use of small-diameter spindles is beneficial to the improvement of spinning speed. At the current spinning of 14.5 tex to 18.5 tex yarns, a diameter of 1.1 mm spindle can be used. However, when spinning a linen/cotton blend yarn of 21.6 tex medium yarn, the diameter of the spindle should be 1.2 mm. It is appropriate.

Feed ratio. The feed ratio is the ratio of the output roller to the front roller speed. It is also an important process parameter, generally controlled between 0.96 and 0.98, but in the production of core yarn, in order to achieve good coating effect, control the filament winding Tension is the key. The principle of straightening the filament without causing accidental elongation is the best when the feed ratio is controlled at 0.9-0.94.

Controlling the temperature and humidity of the workshop is the key to improving the quality and efficiency of jet vortex spinning. Since jet vortex spinning is the fastest machine among all spinning equipments, in addition to strict requirements for the selection of key equipment used, controlling the temperature and humidity of the spinning workshop also ensures smooth production, reduces breakage and improves equipment operation rate. An important measure. It should be adjusted according to the performance of raw materials used and external climate changes to reduce production fluctuations. According to the production practice of domestic production enterprises for many years, the temperature and humidity of the workshop should be controlled at 26 °C ~ 30 °C, and the relative humidity is between 50% and 60%. Conditional enterprises should adopt automatic control and adjustment system to reduce temperature and humidity fluctuations. influences.

Compared with traditional ring spinning, jet vortex spinning has the characteristics of short spinning process, high production efficiency, high degree of intelligent automation of online quality monitoring, and labor saving. It can alleviate the difficulties of domestic spinning enterprises and high processing costs, but with Compared with ring spinning, there are also disadvantages such as low yarn strength. Therefore, in practical applications, it is necessary to give full play to its technical equipment advantages, develop various types of novel yarns, avoid competition with homogenization of ring spinning, and maximize its benefits. (Author: Laboratory research and development of new textile Zhejiang Province chapter of Friends of Cape Zhaolian Ying)